<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app"></div>
</body>
<script src="../js/react.development.js"></script>
<script src="../js/react-dom.development.js"></script>
<script src="../js/babel.min.js"></script>
<script type="text/babel">
    class MyComponent extends React.Component{

        clickBtn = () => {
            const { input1 } = this
            alert( input1.value );
        }

        inputBlur = () => {
            const { input2 } = this
            alert( input2.value );
        }

        input2Ref = ( currentNode ) => {
            this.input2 = currentNode
        }

        render(){
            return (
                <div>
                    <input ref={ ( currentNode ) => this.input1 = currentNode } type="text" placeholder="输入内容"/>
                    <button onClick={ this.clickBtn }>点击出输入内容</button>
                    <input ref={ this.input2Ref } onBlur={ this.inputBlur } type="text" placeholder='失去焦点显示输入内容'/>
                </div>
            )
        }
    }

    let app = (
        <div>
            <MyComponent></MyComponent>
        </div>
    )

    ReactDOM.render(app, document.getElementById('app'))

</script>
</html>